The patch titled
pps: add parallel port PPS client
has been added to the -mm tree. Its filename is
pps-add-parallel-port-pps-client-v7.patch
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------------------------------------------------------
Subject: pps: add parallel port PPS client
From: Alexander Gordeev <lasaine@xxxxxxxxxxxxx>
Signed-off-by: Alexander Gordeev <lasaine@xxxxxxxxxxxxx>
Cc: Rodolfo Giometti <giometti@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/pps/clients/pps_parport.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff -puN drivers/pps/clients/pps_parport.c~pps-add-parallel-port-pps-client-v7 drivers/pps/clients/pps_parport.c
--- a/drivers/pps/clients/pps_parport.c~pps-add-parallel-port-pps-client-v7
+++ a/drivers/pps/clients/pps_parport.c
@@ -79,6 +79,17 @@ static void parport_irq(void *handle)
goto out_assert;
/* try capture the clear edge */
+
+ /* We have to disable interrupts here. The idea is to prevent
+ * other interrupts on the same processor to introduce random
+ * lags while polling the port. Reading from IO port is known
+ * to take approximately 1us while other interrupt handlers can
+ * take much more potentially.
+ *
+ * Interrupts won't be disabled for a long time because the
+ * number of polls is limited by clear_wait parameter which is
+ * kept rather low. So it should never be an issue.
+ */
local_irq_save(flags);
/* check the signal (no signal means the pulse is lost this time) */
if (!signal_is_set(port)) {
_
Patches currently in -mm which might be from lasaine@xxxxxxxxxxxxx are
pps-trivial-fixes.patch
pps-declare-variables-where-they-are-used-in-switch.patch
pps-fix-race-in-pps_fetch-handler.patch
pps-unify-timestamp-gathering.patch
pps-access-pps-device-by-direct-pointer.patch
pps-convert-printk-pr_-to-dev_.patch
pps-move-idr-stuff-to-ppsc.patch
pps-make-idr-lock-a-mutex-and-protect-idr_pre_get.patch
pps-use-bug_on-for-kernel-api-safety-checks.patch
pps-simplify-conditions-a-bit.patch
pps-timestamp-is-always-passed-to-dcd_change.patch
ntp-add-hardpps-implementation.patch
ntp-add-hardpps-implementation-update-v7.patch
pps-capture-monotonic_raw-timestamps-as-well.patch
pps-capture-monotonic_raw-timestamps-as-well-v7.patch
pps-add-kernel-consumer-support.patch
pps-add-kernel-consumer-support-v7.patch
pps-add-parallel-port-pps-client.patch
pps-add-parallel-port-pps-client-v7.patch
pps-add-parallel-port-pps-signal-generator.patch
--
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